For steady, fully developed flow Inside straight pipe of diameter D, neglecting gravity effects, the pressure drop p over a length L and the wall shear stress W are related by

For steady, fully developed flow Inside straight pipe of diameter D, n

1.	For steady, fully developed flow Inside straight pipe of diameter D, neglecting gravity effects, the pressure drop p over a length L and the wall shear stress W are related by
A.	<table><tr><td rowspan="2"> W =</td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center> pD</center></td><td rowspan="2"></td></tr><td align="center">4L</td></table>
B.	<table><tr><td rowspan="2"> W =</td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center> pD </center></td><td rowspan="2"></td></tr><td align="center">4L </td></table>
C.
D.	<table><tr><td rowspan="2"> W =</td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center> pD</center></td><td rowspan="2"></td></tr><td align="center">2L</td></table>
E.	<table><tr><td rowspan="2"> W =</td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>4 pD</center></td><td rowspan="2"></td></tr><td align="center">D</td></table>
Answer» B. <table><tr><td rowspan="2"> W =</td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center> pD </center></td><td rowspan="2"></td></tr><td align="center">4L </td></table>

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For steady, fully developed flow Inside straight pipe of diameter D, neglecting gravity effects, the pressure drop p over a length L and the wall shear stress W are related by

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